Sukhoi Su-57 flight testing and development

Yandex Zen (original "source") is a direct analog of Sohu blogs where everyone can write everything. In Russia Sohu became a joke as many state media citing Sohu private blogs as "Information agency Sohu reported that...". Most of military fanboys Zen blogs ... Famed Army Recognition or National Interest corresponds to them like WSJ to National Enquirer.

For example UEC spokesman Anton Chechukov never said sentence attributed to him in this text. He did never mention Su-57M either.
 
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GizzoJegsaa said:
Full-coverage radar blocker?
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Looks like a full coverage cardboard illustration of non-stealthy flameholder rings around a tailcone with visible turbine blades. They have a long way to go to match the AB cavity low observable features of the F119 and F135.

The large cooling air channels visible along the trailing edges of the divergent flaps are also likely to have a significant radar reflection.
 
F119Doctor said:
Looks like a full coverage cardboard illustration of non-stealthy flameholder rings around a tailcone with visible turbine blades. They have a long way to go to match the AB cavity low observable features of the F119 and F135.

The large cooling air channels visible along the trailing edges of the divergent flaps are also likely to have a significant radar reflection.
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this details are technical incapacities of Saturn or are they design choices? like, a radar blocker right on the exhaust, does it add stress? perhaps you lose thrust? this is a new flame holder compared to other of their engines what's stealth or non-stealth about it? the large cooling channels, perhaps IR for RF trade or there's a win-win approach that would tackle both?
 
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Lepespi said:
this details are technical incapacities of Saturn or are they design choices? like, a radar blocker right on the exhaust, does it add stress, perhaps you lose thrust? this is a new flame holder compared to other of their engines what's stealth or non-stealth about it? the large cooling channels, perhaps IR for RF trade or there's a win-win approach were you would tackle both?
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Or, they really do have an aft end signature solution and they don’t want to publicize the visual details. I have seen P&W do the same thing with F135 displays, with a photo of a F100-229 aft end propped up aft of the turbine exhaust case to block the real view.

Of course, this Su-57 display was just a model, not the real thing. There may not have been any internal details to show.
 
now all it needs is izd-300m which I assume is going to be developed for this plane specifically
 
speaking of ir missiles, is r-74m2/rvv-md2/izd 760 actually in service? I don't think I've seen a live version of the thing
 
flateric said:
Yandex Zen (original "source") is a direct analog of Sohu blogs where everyone can write everything. In Russia Sohu became a joke as many state media citing Sohu private blogs as "Information agency Sohu reported that...". Most of military fanboys Zen blogs ... Famed Army Recognition or National Interest corresponds to them like WSJ to National Enquirer.

For example UEC spokesman Anton Chechukov never said sentence attributed to him in this text. He did never mention Su-57M either.
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Absolutely.
And I've never told anything about SEAD and other tactics that are mentioned there. Well, and when that piece of comments were given by me there were no designations like Su-57M)
 
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PeregrineFalcon said:
View: https://www.youtube.com/watch?v=sAnvCOkLU2o


This thing is a monster!

Loaded with fuel and heavy weapons, it takes a ridiculously short distance to take off and goes straight into the climb, demonstrating unprecedented nose authority.

With the AL-51F engines it is going to be in the league of its own!
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We don't know what was the fuel load and if the weapons are real (ie heavy).
For aero show, the load is always reduced.
 
BonPlan2 said:
We don't know what was the fuel load and if the weapons are real (ie heavy).
For aero show, the load is always reduced.
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The weapons are definitely not real, they are "dummies" that simulate the shape and the weight of the real weapons for testing purposes.
And the fuel load for the air show is not always reduced since the planes are operating most of the time on afterburners and they are fuel guzzlers. Typical fuel load is between 50 and 100% of internal fuel for most of the fighters.
Flankers family or the Felon that have huge fuel fraction don't require 100% of internal fuel for the air show, but even they carry a lot of fuel. For example, Su-35S is carrying between 6-7 tones of fuel for the less demanding air show demo without weapons load, so it is pretty safe to assume that the Su-57 is in the similar ballpark.
 
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Like mentioned before the foreign buyer getting first jets is likely Algeria

Flaterics post ''UAC delivered two Su-57 fighter jets to a foreign buyer''
 

Russia begins export of Su-57 fighter jet​

By Dylan Malyasov - Nov 18, 2025


Sukhoi Su-57 Felon multirole fighter aircraft


Key Points
  • Russia delivered two Su‑57E fifth‑generation fighters to an undisclosed foreign customer, UAC CEO Vadim Badekha said.
  • UAC stated that stable serial production enables more active promotion of the Su‑57 on international markets.

 

The head of the United Aircraft Corporation announced the delivery of two Su-57 aircraft to a foreign customer.​

Moscow. November 17. INTERFAX.RU - Russia has delivered fifth-generation Su-57 fighter jets under an export contract, Vadim Badekha, CEO of the United Aircraft Corporation (UAC, part of Rostec), announced on Channel One.

www.interfax.ru

Глава ОАК заявил о передаче инозаказчику двух самолетов Су-57

Интерфакс: РФ произвела поставки по экспортному контракту истребителей пятого поколения Су-57, заявил генеральный директор Объединенной авиастроительной корпорации (ОАК, входит в "Ростех") Вадим Бадеха в эфире Первого канала."Первые два самолета зарубежный наш заказчик, зарубежный партнер уже...
www.interfax.ru www.interfax.ru
 
F119Doctor said:
Or, they really do have an aft end signature solution and they don’t want to publicize the visual details. I have seen P&W do the same thing with F135 displays, with a photo of a F100-229 aft end propped up aft of the turbine exhaust case to block the real view.

Of course, this Su-57 display was just a model, not the real thing. There may not have been any internal details to show.
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The Su-57 izd.30 (AL-51F-1) flame holder and vanes, based on real pictures, look like ones from EJ200 or YF119. So maybe another signature reduction method? Maybe a partial blocker that optimizes in another area I.e. lower weight? The production F119 is effective but very very heavy, something may not be acceptable for Sukhoi and Saturn, so maybe looking for a lighter solution on izd.30.

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EJ200 and YF119 for comparison.
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PeregrineFalcon said:
This thing is a monster!

Loaded with fuel and heavy weapons, it takes a ridiculously short distance to take off and goes straight into the climb, demonstrating unprecedented nose authority.

With the AL-51F engines it is going to be in the league of its own!
Click to expand...

It is fascinating how fast rotate those 101KS-O optical blocks .
 
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As someone who has thought about aerodynamics for decades now, and has at least some ideas of the physics, it still feels a bit supernatural to me.

Also, doing the airshow routine only to suddenly reveal that it has a loaded weapons bay the whole time is an impressive move (even if the missiles might be inert versions).
 
RadicalDisconnect said:
The Su-57 izd.30 (AL-51F-1) flame holder and vanes, based on real pictures, look like ones from EJ200 or YF119. So maybe another signature reduction method? Maybe a partial blocker that optimizes in another area I.e. lower weight? The production F119 is effective but very very heavy, something may not be acceptable for Sukhoi and Saturn, so maybe looking for a lighter solution on izd.30.
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The AL-51 2D nozzle in this photo appears to be incomplete, with no sidewall liners. The front end of the augmentor is definitely not an LO design, with the flame holders and turbine blades completely visible. The only possible LO feature is if the radial flame holders are angled off axis, but nothing else says LO. The augmentor cavity signature is a difficult challenge.
 
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PeregrineFalcon said:
The weapons are definitely not real, they are "dummies" that simulate the shape and the weight of the real weapons for testing purposes.
And the fuel load for the air show is not always reduced since the planes are operating most of the time on afterburners and they are fuel guzzlers. Typical fuel load is between 50 and 100% of internal fuel for most of the fighters.
Flankers family or the Felon that have huge fuel fraction don't require 100% of internal fuel for the air show, but even they carry a lot of fuel. For example, Su-35S is carrying between 6-7 tones of fuel for the less demanding air show demo without weapons load, so it is pretty safe to assume that the Su-57 is in the similar ballpark.
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once again you don't know. As the jet FBW can adjust with or without internal load, why using a full weight missile mockup?
A full weight mockup is only used if you are making field test of release for exemple.
 
F119Doctor said:
The AL-51 2D nozzle in this photo appears to be incomplete, with no sidewall liners. The front end of the augmentor is definitely not an LO design, with the flame holders and turbine blades completely visible. The only possible LO feature is if the radial flame holders are angled off axis, but nothing else says LO. The augmentor cavity signature is a difficult challenge.
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So here is another shot of the nozzle, seems complete with the sidewall liners.
image0.jpeg
Interesting the vanes look like one of the radar blocker cross sections from Sukhoi’s radar blocker patent for the T-50/Su-57, only that’s for the intake duct in front of the engine. But the back should be similar principle, so if the vanes are slanted or arranged in a cone shape, should achieve similar effects.
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Must remember too that Su-57 flat nozzle is a late request by Sukhoi after aircraft design and shape already completed, and stipulate to Saturn the airframe design can’t change. So full blocker setup like production F119 likely too heavy, with effects on CG and weight and balance since it’s mounted at aircraft rear. So Saturn needs design lighter solution that doesn’t require altering airframe much.
 
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BonPlan2 said:
once again you don't know. As the jet FBW can adjust with or without internal load, why using a full weight missile mockup?
A full weight mockup is only used if you are making field test of release for exemple.
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Mockups are the same weight as the real missiles for the reason, there is no purpose in making them lighter, and here the Russians are using them to show how the plane is able to perform high G and slow speed maneuvers with heavy load inside the weapons bays.
 
BonPlan2 said:
you don't know.
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And here is the interview where the Sergey Bogdan is confirming that at 3:04

View: https://www.youtube.com/watch?v=e8pZ_l79r9g


Translator is not the most accurate, but Bogdan is also claiming that the payload is almost 2 tons heavy, and that it makes no difference in the way the plane performs.
One more thing to note are his claims that there are absolutely no AoA and G restrictions while maneuvering with the heavy air to ground payloads (which is not the case with most fighters) and that only confirms the fact that the airframe is extremely rigid.
 
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What did he said about super cruise? I don’t think the translator did a good job with that.
 
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PeregrineFalcon said:
Mockups are the same weight as the real missiles for the reason, there is no purpose in making them lighter, and here the Russians are using them to show how the plane is able to perform high G and slow speed maneuvers with heavy load inside the weapons bays.
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The initial climb was not as steep as the empty demo. Most of the routine he was using reheat and tvc, so he did use a significant amount of fuel. So this demo was not so light. It would have been cool if they loaded the rear bay too.
 
RadicalDisconnect said:
Must remember too that Su-57 flat nozzle is a late request by Sukhoi after aircraft design and shape already completed, and stipulate to Saturn the airframe design can’t change. So full blocker setup like production F119 likely too heavy, with effects on CG and weight and balance since it’s mounted at aircraft rear. So Saturn needs design lighter solution that doesn’t require altering airframe much.
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Stealthy augmenter is a part of the engine design and iirc not that related to the nozzle changes; I expected all 5th generation engine to be designed with it in mind.
 
Can you show images of what the f-22 engine does on the rear? I don’t see what you guys are describing?
 

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